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unidentified ferari-lookin object
sir can u step out the vehicle. i just got a report of a U.F.O. flyin down the hutch.
by real talk May 04, 2005
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Ugly Fucking Ogre, no definition needed
Dude 1: U.F.O. spotted
Dude 2: What a sight!
by salamip February 08, 2010
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Noun: Pronounced "UF-Foes".

Acronym for "Unidentified Faction Orientation Syndrome"

When a group of cunts, jocks or sluts support the nameless guy that nobody knows at the back of the class with no friends so they look good infront of the other factions, that said nameless person gets "UFOS" and evolves into a Level 2 "Ufo". He then usually becomes part of the group.

Also, sometimes acronym-ed to "Unknown Fucking Organ Donor" because that's all they're good for really.
Slut: "Hey there honey, what's your name?"

Everyone else: "Holy shit, they got another one. He's an Ufo now."

Teacher: "Everyone please be nice to our new Student, Tom Yung."

Everyone: "Uh god, there's another kid with UFOS... Who's gonna snatch him first?"
by The Udon:|:Suicide Death Panda February 14, 2012
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much like the original definition, used to describe somebody unfamiliar, not from your neighborhood or circle.
"who's that kid in the hat over there?"
"I don't know, man. he's UFO."
by dano whatever May 20, 2005
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The sexual act in which a man performs on a woman (preferably someone's mother). First all the lights are turned off for total darkness. Next the man slips a glow-in-the-dark condom over his penis and then begins to float around the dark room; thus giving the effect of a flying spaceship, or other un-identified floating object. The woman then is invited to catch such object with whatever she pleases, i.e. her mouth or other orifices. When the man grows weary of floating around, he then proceeds to crash-land his "ship" into the woman's "Area51”.
"Hey Mitch, I totally UFO 'd your mom last night ! "

"She always loves when I crash my UFO in her. "
by Matty58 March 28, 2008
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In reference to the skiing and snowboarding industry, UFO stands for uncoordinated fucking orient. Applies to all the asian, indian etc. punters who cant ski or board worth a damn and will never be able to - why? Because they are a UFO.
That UFO just stacked it for the 50th time!

I hate teaching UFOs. Its a waste of time!!
by miniseaweed July 31, 2009
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science fiction cult tv show with cool vehicles and sound effects (especially the ufos themselves)
by et October 30, 2003
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